Rainbow-electronics MAX1314 Manual de usuario descargar pdf (Pagina 14)

MAX1304–MAX1306/MAX1308–MAX1310/MAX1312–MAX1314

8-/4-/2-Channel, 12-Bit, Simultaneous-Sampling ADCs

with ±10V, ±5V, and 0 to +5V Analog Input Ranges

14 ______________________________________________________________________________________

Pin Description (continued)

MAX1304

MAX1308

MAX1312

MAX1305

MAX1309

MAX1313

MAX1306

MAX1310

MAX1314

NAME

FUNCTION

20 20 20

REF+

Positive Reference Bypass. Bypass REF+ with a 0.1µF capacitor to AGND. Also

bypass REF+ to REF- with a 2.2µF and a 0.1µF capacitor.

REF+

= V

COM

+ V

REF

/ 2.

21 21 21

COM

Reference Common Bypass. Bypass COM to AGND with a 2.2µF and a 0.1µF

capacitor. V

COM

= 13 / 25 x AV

22 22 22 REF-

Negative Reference Bypass. Bypass REF- with a 0.1µF capacitor to AGND.

Also bypass REF- to REF+ with a 2.2µF and a 0.1µF capacitor.

REF+

= V

COM

- V

REF

/ 2.

24, 39 24, 39 24, 39

DGND

Digital Ground. DGND is the power return for DV

. Connect all DGND

pins together.

25, 38 25, 38 25, 38

Digital Power Input. DV

powers the digital section of the converter, including

the parallel interface. Apply +2.7V to +5.25V to DV

. Bypass DV

to DGND

with a 0.1µF capacitor. Connect all DV

pins together.

26 26 26 D0 D i g i tal I/O 0 of 12- Bi t P ar al l el D ata Bus. H i g h i m p ed ance w hen RD = 1 or CS = 1.

27 27 27 D1 D i g i tal I/O 1 of 12- Bi t P ar al l el D ata Bus. H i g h i m p ed ance w hen RD = 1 or CS = 1.

28 28 28 D2 D i g i tal I/O 2 of 12- Bi t P ar al l el D ata Bus. H i g h i m p ed ance w hen RD = 1 or CS = 1.

29 29 29 D3 D i g i tal I/O 3 of 12- Bi t P ar al l el D ata Bus. H i g h i m p ed ance w hen RD = 1 or CS = 1.

30 30 30 D4 D i g i tal I/O 4 of 12- Bi t P ar al l el D ata Bus. H i g h i m p ed ance w hen RD = 1 or CS = 1.

31 31 31 D5 D i g i tal I/O 5 of 12- Bi t P ar al l el D ata Bus. H i g h i m p ed ance w hen RD = 1 or CS = 1.

32 32 32 D6 D i g i tal I/O 6 of 12- Bi t P ar al l el D ata Bus. H i g h i m p ed ance w hen RD = 1 or CS = 1.

33 33 33 D7 D i g i tal I/O 7 of 12- Bi t P ar al l el D ata Bus. H i g h i m p ed ance w hen RD = 1 or CS = 1.

34 34 34 D8

Digital Output 8 of 12-Bit Parallel Data Bus. High impedance when RD = 1 or

CS = 1.

35 35 35 D9

Digital Output 9 of 12-Bit Parallel Data Bus. High impedance when RD = 1 or

CS = 1.

36 36 36 D10

Digital Output 10 of 12-Bit Parallel Data Bus. High impedance when RD = 1 or

CS = 1.

37 37 37 D11

Digital Output 11 of 12-Bit Parallel Data Bus. High impedance when RD = 1 or

CS = 1.

40 40 40 EOC

E nd - of- C onver si on Output. EOC goes low to i nd i cate the end of a conver si on. It

r etur ns hi g h on the next r i si ng C LK ed g e or the fal l i ng C ON V S T ed g e.

41 41 41

EOLC

End-of-Last-Conversion Output. EOLC goes low to indicate the end of the

last conversion. It returns high when CONVST goes low for the next

conversion sequence.

42 42 42 RD Read Inp ut. P ul l i ng RD l ow i ni ti ates a r ead com m and of the p ar al l el d ata b us.

43 43 43 WR

Write Input. Pulling WR low initiates a write command for configuring the device

with D0–D7.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 35 36

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Rainbow-electronics MAX1314 Manual de usuario Pagina 14

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